Fix bad flagging for le_ase_read_multiple_variable

When the flag is disabled, we would send separate reads, and should not
send the multi read after them.

Flag: le_ase_read_multiple_variable
Bug: 352085435
Bug: 296836982
Test: mma -j32
Test: bond with LE Audio capable device with flag disabled
Change-Id: Id96510eb885cccc90d7e1eb2b9124a8b6f4ed7ef